Monogyclic motor



C. P. STEINMETZ. MONOGYGLIG MOTOR.

Patented famaE 29, H395.

UNITED ASTATES PATENT OEEICE.

CHARLES P. STEINMETZ, OF SCHENECTADY, NEV YORK, ASSIGNOR TO THE THOMSON-HOUSTON ELECTRIC COMPANY, OF BOSTON, MASSACHUSETTS.

MONOCYCLIC MOTOR.

SPECIFICATION forming part of Letters Patent No. 533,250, dated January 29, 1895.

Application filed November 24, 1894. Serial No. 529,806. (No model.)

To all whom, t may concern,.- counter electromotive force balancing the im- Beit known that I, CHARLES P. STETNMETZ, pressed electromotive force at the terminal of a subject of the Emperor of Germany, residthe coil, so that substantially no current flows ing at Schenectady, county of Schenectady, in the coil under these conditions. This con- 5 State of New York, have invented certain new dition of balance may be secured by properly and useful Improvements in Monocyclic Moadjusting or proportioning the teaser windtors, of which the following is a specilication. ings of the generator and motor, or the im- The present invention relates to an impedance of the connecting main or other like proved electric motor, designed to operate in factors well known to electricians. ro substantially the same manner as a single- In the drawing, the main and teaser windphase synchronous alternating motor,butpos ings ofthe generator are shown proportioned sessing certain novel features. as four to one, while in the motor the corre- In the drawing illustrating the invention spending windings bear the proportion of there is shown in diagram an alternating genseven to two. Hence, the counter eleotromo- 15 erator G of the type described in other applitive force developed in the main winding of cations for patents, and commonly known as the motor will be insufficient to prevent the a monocyclic generator. It resembles ordiiiow of energy currents through it, while the nary single-phase alternators, except that it impressed and counter electromotive forces is provided with an additional generating coil in the teaser coils and main 3 will be substan- 2o for maintaining an out-of-phase electromotive tially balanced. When, however, the motor force on a third main connected with the coil. is starting, the counter electromotive force is In the drawingErepresentsashunt-wound less than normal in the teaser coil, so that exciter delivering current to the field windcurrents will flow through the coil and give ing of the generator and regulated by a rheothe motor a self-starting capacity. The chief z5 stat r. function of the teaser coil is to enable the B is the main inducing winding of the almotor to start, thoughin many cases it is useternator, whose terminals are connected by ful to preserve the balance between a numbrushes and rings R R with the mains l, 2, ber of machines when running under varying of a distribution system. conditions of load. When the machine is 8o 3,0 The teaser winding of the generator G is once started it runs as asingle-phase synchroconnected at one end tothe main winding', as nous motor. In starting up a motor of this indicated, and at its other end to a main 3 character, the field of the machine should be through the collector ring and brush R2. left unexcited until the armature has been The motor is shown at. M and is provided brought to speed, as is now the common prac- 35 with a field winding in the circuit of an extice with different forms of polyphase motors. citer E and main and teaser armature wind- By the terms main and teaser coils, ings C C interconnected in the same manner as herein used, I refer to coils arranged and as in the generator. The three free terminals proportioned to have the functions already of the main and teaser windings are in circuit described; that is, the main coil resembles, QQ 4o with branches leading from the mains l, 2,3. and has the function, of the corresponding l Ordinarily, transformers would be used to recoil in machines of the single-phase type. It duce the potential of the currents supplied to carries substantially all the powercurrent opthe motor, but this is a feature well undererating the motor under normal running constood in the art, and is not illustrated, since ditions. The primary object of the teaser 45 it is not a material part of the invention. coil is not to receive power current, but to I prefer that the generator and motor be so generate an ont-of-phase counter electromeproportioned that when the motor is in nortive force normally maintaining abalance bemal operation, alternating currents will Aflow tween the electro-motive forces on the balance through the main winding C supplying the wire to which it is connected. 5o necessary power for operating the motor, What I claim as new, and desire to secure while the teaser coil C simply generates a by Letters Patent of the United States, '1sl. An alternating current motor provided with main and teaser coils, interlinked as described, and a eld winding energized from a source of direct current, as herein set forth.

5 2. In an electrical distribution system, the combination of mains carrying alternating currents, and a third main upon which an outof-phase electromotive force is maintained, in combination with an electric motor having in- Ie terconnected main and `teaser windings in circuit with the dierent mains, and proportioned so that when in normal operation currents for operating the motor flow only through the main Winding and a source of direct current energizing the field Winding of the m0- tor, as set forth.

In Witness whereof I have hereunto set my hand this 21st day of November7 1894:.

CHARLES P. STEINMETZ. Witnesses:

B. B. HULL, A. F. MACDONALD. 

